<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  .container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 200px 200px;
    gap: 20px;
    background-color: aquamarine;
  }
  .container > .item {
     background-color: #f44336;
     color: #fff;
     padding: 20px;
     font-size: 20px;
  }
</style>
<body>
  <div class="container">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
    <div class="item">6</div>
    <div class="item">7</div>
    <div class="item">8</div>
    <div class="item">9</div>
    <div class="item">10</div>
    <div class="item">11</div>
  </div>
  
</body>
</html>